package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //检验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("无效的手机号");
        }
        //生成验证码
        String code = RandomUtil.randomNumbers(6);
        //将验证码信息保存到redis中
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL,TimeUnit.MINUTES);
        //发送验证码(待实现)
        log.debug("发送验证码成功:{}",code);
        //返回结果
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone = loginForm.getPhone();
        //1.检验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("无效的手机号");
        }
        //2.检验验证码
        String code = loginForm.getCode();
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if (cacheCode == null || !cacheCode.equals(code)){
            return  Result.fail("验证码错误");
        }


        //3.根据手机号查询用户
        User user = query().eq("phone", phone).one();

        //4.判断用户是否存在
        if (user == null) {
            //4.1如果不存在创建一个新用户并保存到数据库
            user =  creatNewUserWithPhone(phone);

        }
        //5.保存用户到redis中
        //生成UUID作为key
        String token = UUID.randomUUID().toString(true);

        //将user对象转换为UseDTO
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        //将userDTO转为map
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true).setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));
        String tokenKey = LOGIN_USER_KEY + token;
        //将map数据保存到redis中
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL, TimeUnit.MINUTES);
        log.info("token = {}",token);
        return Result.ok(token);
    }

    private User creatNewUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));

        save(user);
        return user;
    }
}
